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My suggestion would be to check the MRG/MRGL settings of the IP phones, IP communicators and gateways in CUCM. Make sure you do not have MTP's being allocated incorrectly. You may have a scenario where an MTP or Transoder on SiteA's VG is being allocated for calls that come into SiteB's VG and go to IP Communicators at SiteB. In such a scenario RTP traffic would be sent from SiteB VG to SiteA VG, then back to the IP Communicators at SiteB, effectively traversing the WAN twice. To check this, the command "show sccp connection" would show you any allocated SCCP resources on your gateway (such as MTP, XCODE or Hardware Conference). Also, if the VG's are also the WAN routers, you could be allocating MTP on the CUCM itself (which you would not see in the above command). I hope this helps!